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Passed over this comment as a weak joke. Three hours later found out this is actually true. The UK's nuclear fleet really does run a version of Windows XP branded 'Windows for Submarines'. XP hasn't been supported by Microsoft since 2014. Government won't say if they have support for Windows for Submarines. Could the misfire be a result of a hack? Fleet has an airgap but had just been serviced.
Malaconotus-
Ha! Yeah, I wasn't joking. I imagine the MOD probably handles the security themselves though. It's probably a very cut-down version of XP.
Doubt it was hacked. The only way would be with a USB a la stuxnet but I'm really not qualified to say if the subs even have USB ports.
Far more likely it misfired because rockets are tricky and go wrong sometimes.
Well_is_it
Windows for Submarines.